Abstract: A uniaxial bidirectional synchronous control electromagnetic loaded dynamic shear test system and method, a test apparatus thereof including a support platform, a loading bar system, an electromagnetic pulse generation system, a servo-controlled normal pressure loading system, and a data monitoring and acquisition system. The test apparatus can be used to conduct a dynamic shear test research on a rock-like material under a constant normal pressure close to an actual operating condition, and can also be applied to carry out dynamic shear tests on intact rock-like test specimens in various sizes or jointed rock-like test specimens containing a single structural surface to study dynamic shear mechanical property and shear failure behavior under strain rate of 101?103 s?1, thereby providing an important theoretical and technical support for the design, construction, protection, and safety and stability evaluation of geotechnical engineering, structural engineering.

Abstract: Disclosed is a transmitting method, a receiving method, a transmitting device, a receiving device, and a transmission system for a control instruction in long-distance transmission. The transmitting method comprises the follows. A control instruction is obtained by a receiving device via a first transmission medium interface. The control instruction is encapsulated by the receiving device to obtain a packet including the control instruction. The packet is transmitted by the receiving device to a transmitting device via a second transmission medium interface. By adopting the disclosure, control of the video source device connected to the transmitting device can be achieved by transmitting the control instruction via a cable or optical fiber, and the user experience is high.

Abstract: A massage head unit, a vibration assembly and a smart wearable device, including: a soft rubber base plate, a plurality of vibrating members, a plurality of soft rubber massage heads, and a plurality of soft rubber pleated bodies capable of stretching and deforming in a axial direction of each massage head; the base plate, the pleat bodies and the massage heads are integrally molded by injection molding, the base plate is provided with a plurality of through holes penetrating therethrough, and the through holes, the pleated bodies and the massage heads are in one-to-one correspondence, each massage head is provided with a mounting cavity mounted with at least one vibrating member, each pleated body is connected to a bottom of the massage head and an edge of the through hole, such that each of the massage heads is floating and supported on the edge of the through hole.

Abstract: A speaker includes a frame and a partition wall coupled with the frame to form a boundary between an inner chamber and an outer chamber. The frame has an annular sidewall and a top wall. The annular sidewall has a plurality of through holes allowing the inner chamber and the outer chamber in fluid communication.

Abstract: A method for retrieving an audio file includes: collecting an audio segment in real time; and for every two chronologically adjacent audio frames in a plurality of audio frames of the audio segment, acquiring a difference value between spectral centroids of a sub-band corresponding to the two audio frames, to obtain a plurality of difference values; and obtaining an audio fingerprint corresponding to the two audio frames based on the plurality of difference values. A quantity of the plurality of difference values equaling a quantity of sub-bands of one of the two audio frames. Each bit of the audio fingerprint being determined based on a comparison between a difference value corresponding to the bit and a preset difference value threshold. The method also includes retrieving, in an audio file library based on audio fingerprints of the plurality of audio frames, a target audio file matching the audio segment.

Abstract: A supercapacity lithium ion battery cathode material, a preparation method therefor and an application thereof. The supercapacity lithium ion battery cathode material consists of a transition metal-containing lithium ion cathode material and carbon which is coated on the surface of the lithium ion cathode material. The transition metal on the surface of the lithium ion cathode material is coordinated with carbon by means of X—C bonds to form transition metal-X—C chemical bonds, such that carbon stably coats the surface of the cathode material, wherein C is SP3 hybridization and/or SP2 hybridization, and X is at least one selected from among N, O and S.

Abstract: A method and device for stratified image segmentation are provided. The method includes: obtaining a three-dimensional (3D) image data set representative of a region comprising at least three levels of objects; generating a first segmentation result indicating boundaries of anchor-level objects in the region based on a first neural network (NN) model corresponding to the anchor-level objects; generating a second segmentation result indicating boundaries of mid-level objects in the region based on the first segmentation result and a second NN model corresponding to the mid-level objects; and generating a third segmentation result indicating small-level objects in the region based on the first segmentation result, a third NN model corresponding to the small-level objects, and cropped regions corresponding to the small-level objects.

Abstract: A data transmission method and apparatus, and a computer storage medium are disclosed in this application. The method includes: receiving, by a conference management server, a connection request transmitted by a live streaming terminal; assigning a signaling server and a data transmission proxy server to a region according to region information, and the signaling server establishes a connection to a multimedia device; assigning a multimedia device proxy server to the multimedia device in response to detecting that the connection between the signaling server and the multimedia device is successfully established; assigning a live streaming proxy server to the live streaming terminal in response to a live streaming operation of the live streaming terminal; and performing, by using the data transmission proxy server, the multimedia device proxy server, and the live streaming proxy server, format conversion on data to be transmitted between the live streaming terminal and the multimedia device.

Abstract: An intelligent drying method and an ultraviolet sterilization container are applied to an ultraviolet sterilization container for drying a sterilized article, the method comprising: that the sterilization container sequentially executes the following steps after receiving a drying instruction: releasing hot air to an article storage cavity; when an initial drying time is reached, collecting the intracavity temperature of the article storage cavity; automatically obtaining an extended drying time corresponding to the intracavity temperature of the article storage cavity; and continuously releasing hot air to the article storage cavity until the extended drying time is reached. The ultraviolet sterilization container includes: an article storage cavity, a heating air duct, a microprocessor, and a memory storing a computer readable program executable by the microprocessor. When the computer readable program is executed by the microprocessor, the sterilization container performs the above steps.